Loudspeaker with a fin-reinforced voice coil structure

Abstract

The invention provides a loudspeaker with a fin-reinforced voice coil structure, comprising a voice coil, fins, an upper magnetic conductor, and a magnetic conduction column, wherein a magnetic gap is formed between the upper magnetic conductor and the magnetic conduction column located in the center thereof; the voice coil works in the magnetic gap; wherein the inner wall of the voice coil is connected to the fins; wherein one end of each fin is connected and fixed to the inner wall of the voice coil; wherein the magnetic conduction column is provided with fin grooves for accommodating the other ends of the fins; wherein the width of the fin grooves is at least 0.2 mm greater than the thickness of the fins, so that the balance performance and the stability of the voice coil are greatly improved. The distortion is greatly reduced compared, by measurement, with the traditional voice coil.

The invention claimed is: 
     
       1. A loudspeaker with a fin-reinforced voice coil structure comprises a voice coil ( 34 ), fins ( 3 ), an upper magnetic conductor ( 6 ), and a magnetic conduction column ( 7 ), characterized in that: a magnetic gap is formed between the upper magnetic conductor ( 6 ) and the magnetic conduction column ( 7 ) located in the center thereof; the voice coil ( 34 ) works in the magnetic gap; wherein the inner wall of the voice coil ( 34 ) is connected to the fins ( 3 ); wherein one end of each fin ( 3 ) is connected and fixed to the inner wall of the voice coil ( 34 ); wherein the magnetic conduction column ( 7 ) is provided with fin grooves ( 8 ) for accommodating the other ends of the fins ( 3 ); wherein the width of the fin grooves ( 8 ) is at least 0.2 mm greater than the thickness of the fins; the height of the fins ( 3 ) is less than or equal to the height of the voice coil ( 34 ). 
     
     
       2. The loudspeaker with a fin-reinforced voice coil structure according to  claim 1 , wherein the voice coil ( 34 ) includes an inner voice coil ( 2 ) and an outer voice coil ( 1 ) to form a finned double voice coil; wherein the outer voice coil ( 1 ) and the inner voice coil ( 2 ) are both in the shape of a hollow barrel; wherein the outer voice coil ( 1 ) and the inner voice coil ( 2 ) are both wound with a conductive coil, and the outer layer of the conductive coil is provided with insulating material; wherein the magnetic conduction column is the first upper magnetic conductor ( 7 ); wherein the upper magnetic conductor is an annular third upper magnetic conductor ( 6 ). 
     
     
       3. The loudspeaker with a fin-reinforced voice coil structure according to  claim 2 , wherein below the first upper magnetic conductor ( 7 ) are a second cylindrical radial permanent magnet A ( 9 ) and a second lower magnetic conduction plate ( 10 ); wherein the second lower magnetic conduction plate ( 10 ) is connected with a lower magnetic conduction plate ( 11 ); wherein between the annular third upper magnetic conductor ( 6 ) and the lower magnetic conduction plate ( 11 ) is a first annular axial permanent magnet ( 12 ); wherein an outer magnetic gap ( 15 ) is formed between the annular third upper magnetic conductor ( 6 ) and an annular second upper magnetic conductor ( 5 ); wherein the outer voice coil ( 1 ) works in the outer magnetic gap ( 15 ); wherein an inner magnetic gap ( 16 ) is formed between the first upper magnetic conductor ( 7 ) and the annular second upper magnetic conductor ( 5 ); wherein the inner voice coil ( 2 ) works in the inner magnetic gap ( 16 ); wherein the magnetic polarity of the second lower magnetic conduction plate ( 10 ) is the same as that of the lower magnetic conduction plate ( 11 ) and the second upper magnetic conductor ( 5 ); wherein the first annular axial permanent magnet ( 12 ) and the second cylindrical radial permanent magnet A ( 9 ) form a closed magnetic circuit in the outer magnetic gap ( 15 ) and inner magnetic gap ( 16 ) through the first upper magnetic conductor ( 7 ), the annular second upper magnetic conductor ( 5 ), the annular third upper magnetic conductor ( 6 ), the second lower magnetic conduction plate ( 10 ) and the lower magnetic conduction plate ( 11 ); wherein the fin groove ( 8 ) corresponding to the fin ( 3 ) is provided on the second upper magnetic conductor ( 5 ). 
     
     
       4. The loudspeaker with a fin-reinforced voice coil structure according to  claim 2 , wherein a second lower magnetic conductor ( 13 ) is connected below the first upper magnetic conductor ( 7 ); wherein above the second lower magnetic conductor ( 13 ) is a second annular radial permanent magnet B ( 14 ); wherein above the second annular radial permanent magnet B ( 14 ) is the lower magnetic conduction plate ( 11 ); wherein above the lower magnetic conduction plate ( 11 ) is the first annular axial permanent magnet ( 12 ); wherein above the first annular axial permanent magnet ( 12 ) is the annular third upper magnetic conductor ( 6 ); wherein an outer magnetic gap ( 15 ) is formed between the annular third upper magnetic conductor ( 6 ) and the annular second upper magnetic conductor ( 5 ); wherein the outer voice coil ( 1 ) works in the outer magnetic gap ( 15 ); wherein an inner magnetic gap ( 16 ) is formed between the first upper magnetic conductor ( 7 ) and the annular second upper magnetic conductor ( 5 ); wherein the inner voice coil ( 2 ) works in the inner magnetic gap ( 16 ); wherein the annular third upper magnetic conductor ( 6 ) and the second lower magnetic conductor ( 13 ) are the same magnetic polarity; wherein the first annular axial permanent magnet ( 12 ) and the second annular radial permanent magnet B ( 14 ) form a closed magnetic circuit in the outer magnetic gap ( 15 ) and inner magnetic gap ( 16 ) through the first upper magnetic conductor ( 7 ), the annular second upper magnetic conductor ( 5 ), the annular third upper magnetic conductor ( 6 ), the lower magnetic conduction plate ( 11 ) and the second lower magnetic conductor ( 13 ); wherein the fin groove ( 8 ) corresponding to the fin ( 3 ) is provided on the second upper magnetic conductor ( 5 ). 
     
     
       5. The loudspeaker with a fin-reinforced voice coil structure according to  claim 2 , wherein the first upper magnetic conductor ( 7 ) is arranged in the center of a magnetic conductive bowl ( 17 ); wherein an annular radial permanent magnet C ( 18 ) is provided in the magnetic conductive bowl ( 17 ); wherein the inner diameter of the annular radial permanent magnet C ( 18 ) is greater than the maximum outer diameter of the first upper magnetic conductor ( 7 ); wherein the outer diameter of the annular radial permanent magnet C ( 18 ) is smaller than the inner diameter of the magnetic conductive bowl ( 17 ); wherein the annular second upper magnetic conductor ( 5 ) is arranged above the annular radial permanent magnet C ( 18 ); wherein an outer magnetic gap ( 15 ) is formed between the annular second upper magnetic conductor ( 5 ) and the annular third upper magnetic conductor ( 6 ) on the magnetic conductive bowl ( 17 ); wherein the outer voice coil ( 1 ) works in the outer magnetic gap ( 15 ); wherein an inner magnetic gap ( 16 ) is formed between the annular second upper magnetic conductor ( 5 ) and the first upper magnetic conductor ( 7 ); wherein the inner voice coil ( 2 ) works in the inner magnetic gap ( 16 ); wherein the annular radial permanent magnet C ( 18 ) is magnetized in the axial direction, forming a closed magnetic circuit in the outer magnetic gap ( 15 ) and inner magnetic gap ( 16 ) through the magnetic conductive bowl ( 17 ), the first upper magnetic conductor ( 7 ) and the annular second upper magnetic conductor ( 5 ); wherein the fin groove ( 8 ) corresponding to the fin ( 3 ) is provided on the second upper magnetic conductor ( 5 ); wherein the outer ring of the magnetic conductive bowl ( 17 ) is replaced with an annular radial permanent magnet D ( 19 ); wherein as a replacement, a cylindrical radial permanent magnet E ( 20 ) is provided between the first upper magnetic conductor ( 7 ) and the bottom of the magnetic conductive bowl ( 17 ); the annular radial permanent magnet D ( 19 ), the cylindrical radial permanent magnet E ( 20 ) and the annular radial permanent magnet C ( 18 ) are magnetized in reverse, and the three permanent magnets form a series relationship; the outer magnetic gap ( 15 ) and the inner magnetic gap ( 16 ) obtain high magnetic flux density. 
     
     
       6. The loudspeaker with a fin-reinforced voice coil structure according to  claim 2 , wherein the first upper magnetic conductor ( 7 ) is the center, and the top inner magnetic gap ( 16 ) is formed between the first upper magnetic conductor ( 7 ) and the annular second upper magnetic conductor ( 5 ); wherein the top outer magnetic gap ( 15 ) is formed between the annular second upper magnetic conductor ( 5 ) and the third upper magnetic conductor ( 6 ); wherein below the first upper magnetic conductor ( 7 ) are, in turn, the cylindrical radial permanent magnets E ( 20 ), and a first lower magnetic conductor ( 23 ); wherein below the annular second upper magnetic conductor ( 5 ) are, in turn, the annular radial permanent magnet C ( 18 ), and a second lower magnetic conductor ( 22 ); wherein below the annular third upper magnetic conductor ( 6 ) are, in turn, the annular radial permanent magnet D ( 19 ), the annular third lower magnetic conductor ( 21 ); wherein a bottom inner magnetic gap ( 25 ) is formed between the first lower magnetic conductor ( 23 ) and the annular second lower magnetic conductor ( 22 ); wherein the bottom inner magnetic gap ( 25 ) and the top inner magnetic gap ( 16 ) are integrally connected; wherein the inner voice coil ( 2 ) extends from the top inner magnetic gap ( 16 ) to the bottom inner magnetic gap ( 25 ); on the inner voice coil ( 2 ), a conductive coil of the top inner voice coil ( 28 ) and a conductive coil of the bottom inner voice coil ( 30 ) are respectively wound at the top inner magnetic gap ( 16 ) and the bottom inner magnetic gap ( 25 ); wherein a bottom outer magnetic gap ( 25 ) is formed between the second lower magnetic conductor ( 22 ) and the annular third lower magnetic conductor ( 21 ); wherein the bottom outer magnetic gap ( 24 ) and the top outer magnetic gap ( 15 ) are integrally connected; wherein the outer voice coil ( 1 ) extends from the top outer magnetic gap ( 15 ) to the bottom outer magnetic gap ( 24 ); wherein a conductive coil of the top outer voice coil ( 27 ) and a conductive coil of the bottom outer voice coil are respectively wound at the corresponding top outer magnetic gap ( 15 ) and the bottom outer magnetic gap ( 24 ); wherein the outer voice coil ( 1 ) and the inner voice coil ( 2 ) are connected by the top fin ( 3 ) passing through the second upper magnetic conductor ( 5 ) and the bottom fin ( 26 ) through the annular second lower magnetic conductor ( 22 ); wherein the annular second upper magnetic conductor ( 5 ) is provided with a fin groove corresponding to the top fin ( 3 ); wherein the annular second lower magnetic conductor ( 22 ) is provided with a fin groove corresponding to the bottom fin ( 26 ); wherein the annular radial permanent magnet D ( 19 ) and the cylindrical radial permanent magnet E ( 20 ) are magnetized in the same direction; wherein the magnetizing direction of the annular radial permanent magnet C ( 18 ) is opposite to that of the annular radial permanent magnet D ( 19 ) and the cylindrical radial permanent magnet E ( 20 ); wherein through the six magnetic conductor of the first upper magnetic conductor ( 7 ), the annular second upper magnetic conductor ( 5 ), the annular third upper magnetic conductor ( 6 ), the first lower magnetic conductor ( 23 ), the annular second lower magnetic conductor ( 22 ) and the annular third lower magnetic conductor ( 21 ), the three permanent magnets of the annular radial permanent magnet C ( 18 ), annular radial permanent magnet D ( 19 ) and the cylindrical radial permanent magnet E ( 20 ) form a closed magnetic circuit in the four positions of the top inner magnetic gap ( 16 ), the top outer magnetic gap ( 15 ), the bottom outer magnetic gap ( 24 ) and the bottom inner magnetic gap ( 25 ). 
     
     
       7. The loudspeaker with a fin-reinforced voice coil structure according to  claim 2 , wherein the first upper magnetic conductor ( 7 ) is arranged in the center of the magnetic conductive bowl ( 17 ); wherein an annular radial permanent magnet F ( 32 ) is provided between the first upper magnetic conductor ( 7 ) and the third upper magnetic conductor ( 6 ) in the magnetic conductive bowl ( 17 ); the annular radial permanent magnet F ( 32 ) is connected and fixed to the bottom of the magnetic conductive bowl ( 17 ) through a non-magnetic conductive gasket ( 31 ); wherein the outer magnetic gap ( 15 ) is formed between the annular radial permanent magnet F ( 32 ) and the third upper magnetic conductor ( 6 ); wherein the outer voice coil ( 1 ) is arranged in the outer magnetic gap ( 15 ); wherein the inner magnetic gap ( 16 ) is formed between the annular radial permanent magnet F ( 32 ) and the first upper magnetic conductor ( 7 ); wherein the inner voice coil ( 2 ) works in the inner magnetic gap ( 16 ); wherein magnetized radially, the annular radial permanent magnet F ( 32 ) forms a closed magnetic circuit in the inner magnetic gap ( 16 ) and the top outer magnetic gap ( 15 ) with the first upper magnetic conductor ( 7 ) and the third upper magnetic conductor ( 6 ); wherein the fin groove ( 8 ) corresponding to the fin ( 3 ) is provided on the annular radial permanent magnet F ( 32 ). 
     
     
       8. The loudspeaker with a fin-reinforced voice coil structure according to  claim 2 , wherein the voice coil is a direct conductive coil without a skeleton; wherein the fins ( 3 ) are directly fixed and connected to the conductive coil. 
     
     
       9. The loudspeaker with a fin-reinforced voice coil structure according to  claim 1 , wherein there are at least two fins ( 3 ); wherein the fins ( 3 ) intersect each other and connect to the center point of the magnetic conduction column ( 7 ). 
     
     
       10. The loudspeaker with a fin-reinforced voice coil structure according to  claim 1 , wherein there are at least two fins ( 3 ); wherein parts of the fins ( 3 ) intersect each other and connect to the center point of the magnetic conduction column ( 7 ), and the height of the intersecting part is smaller than that of the voice coil in the radial direction; intersecting each other and connecting to the center point of the magnetic conduction column ( 7 ), the fins ( 3 ) extend upward to the same height as the voice coil ( 34 ) and do not intersect each other.